package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
//@WebFilter(filterName = "loginCheckFilter" , urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器,支持通配符
    public static  final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
//        log.info("拦截到请求:   {}" , request.getRequestURI());//{} 占位符
//        filterChain.doFilter(request,response);

        //1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:   {}" , request.getRequestURI());//{} 占位符

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        if (request.getSession().getAttribute("employee") !=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            Long id = (Long) request.getSession().getAttribute("employee");
            BaseContext.setThreadLocal(id);
            filterChain.doFilter(request,response);
            return;
        }

        //判断用户登录状态,如果已经登录,直接放行
        if (request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setThreadLocal(userId);

            filterChain.doFilter(request,response);
            return;
        }

        log.info("用户未登录");
        //如果用户未登录返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public  boolean check(String[] urls , String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
